# typed: true
# frozen_string_literal: true

require "formula"
require "cask/cask_loader"

# Helper module for validating syntax in taps.
#
# @api private
module Readall
  class << self
    include Cachable

    # TODO: remove this once the `MacOS` module is undefined on Linux
    MACOS_MODULE_REGEX = /\b(MacOS|OS::Mac)(\.|::)\b/
    private_constant :MACOS_MODULE_REGEX

    private :cache

    def valid_ruby_syntax?(ruby_files)
      failed = T.let(false, T::Boolean)
      ruby_files.each do |ruby_file|
        # As a side effect, print syntax errors/warnings to `$stderr`.
        failed = true if syntax_errors_or_warnings?(ruby_file)
      end
      !failed
    end

    def valid_aliases?(alias_dir, formula_dir)
      return true unless alias_dir.directory?

      failed = T.let(false, T::Boolean)
      alias_dir.each_child do |f|
        if !f.symlink?
          onoe "Non-symlink alias: #{f}"
          failed = true
        elsif !f.file?
          onoe "Non-file alias: #{f}"
          failed = true
        end

        if formula_dir.glob("**/#{f.basename}.rb").any?(&:exist?)
          onoe "Formula duplicating alias: #{f}"
          failed = true
        end
      end
      !failed
    end

    def valid_formulae?(tap, bottle_tag: nil)
      cache[:valid_formulae] ||= {}

      success = T.let(true, T::Boolean)
      tap.formula_files.each do |file|
        valid = cache[:valid_formulae][file]
        next if valid == true || valid&.include?(bottle_tag)

        formula_name = file.basename(".rb").to_s
        formula_contents = file.read(encoding: "UTF-8")

        readall_namespace = "ReadallNamespace"
        readall_formula_class = Formulary.load_formula(formula_name, file, formula_contents, readall_namespace,
                                                       flags: [], ignore_errors: false)
        readall_formula = readall_formula_class.new(formula_name, file, :stable, tap: tap)
        readall_formula.to_hash
        # TODO: Remove check for MACOS_MODULE_REGEX once the `MacOS` module is undefined on Linux
        cache[:valid_formulae][file] = if readall_formula.on_system_blocks_exist? ||
                                          formula_contents.match?(MACOS_MODULE_REGEX)
          [bottle_tag, *cache[:valid_formulae][file]]
        else
          true
        end
      rescue Interrupt
        raise
      rescue Exception => e # rubocop:disable Lint/RescueException
        onoe "Invalid formula (#{bottle_tag}): #{file}"
        $stderr.puts e
        success = false
      end
      success
    end

    def valid_casks?(_tap, os_name: nil, arch: nil)
      true
    end

    def valid_tap?(tap, aliases: false, no_simulate: false, os_arch_combinations: OnSystem::ALL_OS_ARCH_COMBINATIONS)
      success = true

      if aliases
        valid_aliases = valid_aliases?(tap.alias_dir, tap.formula_dir)
        success = false unless valid_aliases
      end

      if no_simulate
        success = false unless valid_formulae?(tap)
        success = false unless valid_casks?(tap)
      else
        os_arch_combinations.each do |os, arch|
          bottle_tag = Utils::Bottles::Tag.new(system: os, arch: arch)
          next unless bottle_tag.valid_combination?

          Homebrew::SimulateSystem.with os: os, arch: arch do
            success = false unless valid_formulae?(tap, bottle_tag: bottle_tag)
            success = false unless valid_casks?(tap, os_name: os, arch: arch)
          end
        end
      end

      success
    end

    private

    def syntax_errors_or_warnings?(filename)
      # Retrieve messages about syntax errors/warnings printed to `$stderr`.
      _, err, status = system_command(RUBY_PATH, args: ["-c", "-w", filename], print_stderr: false)

      # Ignore unnecessary warning about named capture conflicts.
      # See https://bugs.ruby-lang.org/issues/12359.
      messages = err.lines
                    .grep_v(/named capture conflicts a local variable/)
                    .join

      $stderr.print messages

      # Only syntax errors result in a non-zero status code. To detect syntax
      # warnings we also need to inspect the output to `$stderr`.
      !status.success? || !messages.chomp.empty?
    end
  end
end

require "extend/os/readall"
